Filter.



No. 733,622. PATENTED JULY 14, 1903. R. S. BROWNLW.

FILTER.

ni@ r /l/J Tv/wahr..

wz wams pasas so. anomuwc wswwmon. ofc,

Nd. 733,622. -PATENTED JULY 14, 1903.

' R. S. BROWNLOW. l

Tn: mams varias au. m4a1-wurm.. wnsmnnron. n. c.

NrTEn STATES Patented July 14, 1903.

PATENT OFFICEs FILTER. y

SPECIFICATION forming part of Letters Patent No. '733,622, dated July 14, 1903.

Application filed June l0, 1902.

.To all whom, t may concern:

Be it known that I, RICHARD SYDNEY BEoWNLoW, a subject of the King of Great Britain and Ireland, residing at Abbey Hey Vorks, Gorton, Manchester, in the county of Lancaster, England, have invented new and usefullmprovements Applicable to Filters, of Whiclrthe following is a specification.

rlhis invention relates to improvements in portable field-filters for the use of troops and thelike; and my improvements consist principally of a tripod stand, force-pump, and an air vessel by which Water to be filtered is forced through the filtering medium, Which is formed of a cylinder of porous earthenware or other suitable iiltering material, the filtered Water passing off from the interior of said cylinder for use as required.

In the accompanying drawings, illustrating my said invention and to which I hereinafter refer, Figure 1 is a side elevation, and Fig. 2 a plan, of a filter such as I have hereinbefore named With my improvements applied. Fig. 25 is a vertical section of my improved filter drawn to an enlarged scale.

In the views the same figures refer to like parts.

It has been found that filters which have been employed for filteringwater containing a considerable amount of mud or clay in suspension are very liable to become soon choked by reason of the mud and clay accumulating outside the porous cylinders, necessitating frequent removal and cleansing in order to maintain their proper efficiency.

The object of this myinvention is to remedy this defect by removing or collecting the greaterportion of the suspended mud or clay from the water before it reaches the outer surface of the porous filtering material. For this purpose I bolt or otherwise fix to the upper part of the force-pump 1 a primary filter consisting of avmetallic cylinder or case 2, the top of which is dome-shaped and forms an air-chamber by means of Which a regular and continuous flou7 of Water is maintained from the pump to the upper portion of the cylinder 2 through the tube 3, Which is fitted, preferably, Within said cylinder, the same regular flow being also maintained through the outlet. I place Within the cylinder 2 a Serial No. 111,047. (No model.)

lining of strong tinned gauze el, formed With vertical strengthening --ribs, which prevent the gauze from being forced against the side of the filter by the pressure of Water and alloW a free course for the Water between the said ribs, and I place Within this gauze-lining bags, as 5 and 6, formed of any preferred Woven fabric. These bags are iiXed to and supported by metal rings 7 and 8, with indiarubber Washers 9 and 10 between them, forming an air and Water tight joint. The upper end of the pipe 3 passes through into the interior of the bags 5 and G, Which maybe lled with sand, charcoal, or other filtering material, and another rubber ring 1l makes a joint with the cover. The upper end of the pipe 3 is threaded andV passes through a small hole in the bags 5 and 6, and aWater-tight joint is made with the bags by screwing down a winged nut 12 against a rubber Washer sitting on the flange of pipe 3.

The bags 5 anl 6 may in preference be filled with a thick liquid consisting of fine asbestos powder or other similar filtering material mixed With Water to a creamy consistency, which adheres to and coats the surface of the bags, thus forming an additional filter. Y I connect the outlet 13 at the base of the cylinder 2 With a pipe 1-1, leading into the cylinder or casing l5, in which the porous earthenware cylinder 16 is contained, through which the Water percolates and is drawn off through the outlet 17.

As an additional protection against mud or other solid matters in suspension settling on the surface of the porous cylinder, I may inclose the said porous cylinder in a tubular bag 1S, made of closely-Woven material, filtering-cloth, felt, or other material of a similar nature stiffened With rings of Wire or with Wire-gauze placed between the bag and the cylinder and so made that it can be readily removed and replaced. In like manner the bags 5 and 6, hereinbefore described, can be easily taken out, Washed, and replaced. By these means the pores in the filtering-cylinders 1G will not be liable to become choked, and the efficiency of such cylinders Will thereby be prolonged almost indefinitely.

I claim as my inventiony The herein-described portable filtering ap- IOS) 1o the Compressed-air chamber, whereby a oontinuous iow of liquid is maintained through said filters, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

RICHARD SYDNEY BROWNLOW. lVitnesses:

J No. HUGHES, J. ERNEST HUGHES. 

